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  </head>
  <body for="html-export" id="body">
    <div class="smartperf smartperf-preview">
      <h1 class="mume-header fontColor">Native Memory抓取和展示说明</h1>

      <p class="fontColor">Native Memory是查看内存的分配和释放等情况。</p>
      <h2 class="mume-header fontColor">Native Memory的抓取</h2>

      <h3 class="mume-header fontColor">Native Memory抓取配置参数</h3>

      <p class="fontColor">
        <img src="../figures/NativeMemory/nativememorysetting.jpg" alt="GitHub Logo" /><br />
        配置参数说明：
      </p>
      <ul class="fontColor">
        <li>ProcessId or ProcessName：设置抓取的进程ID或者进程名，此处以输入com.ohos.mms进程名为例。</li>
        <li>Max unwind level：抓取的栈的最大深度。</li>
        <li>Shared Memory Size：native_daemon和native_hook进程之间存储数据的共享内存大小。</li>
        <li>Filter Memory Size：只抓取大于该size的malloc数据（free不受影响）。</li>
        <li>Use Fp Unwind：Fp回栈。</li>
        <li>Use Record Accurately：不过滤数据，上报全量的。</li>
        <li>Use Offline Symbolization：离线符号化。</li>
        <li>Use Record Statistics：统计数据上报。</li>
        <li>statistics interval：统计数据上报周期。</li>
      </ul>
      <p class="fontColor">
        再点击Record setting，在output file path输入文件名hiprofiler_data_nativememory.htrace，拖动滚动条设置buffer
        size大小是64M，抓取时长是50s。<br />
        <img src="../figures/NativeMemory/nativememoryset.jpg" alt="GitHub Logo" />
      </p>
      <p class="fontColor">
        点击Trace command，就会根据上面的配置生成抓取命令，点击复制按钮，会将命令行复制。<br />
        <img src="../figures/NativeMemory/nativememorycommand.jpg" alt="GitHub Logo" />
      </p>
      <p class="fontColor">命令行参数说明：</p>
      <ul class="fontColor">
        <li>save_file：是否将hook数据保存成文件，不上报protobuf形式数据给hiprofilerd。</li>
        <li>filter_size：过滤malloc的大小，最小值是0，默认值是4096Byte。</li>
        <li>smb_pages：nativedeamon与libnativehook间的共享内存大小。</li>
        <li>max_stack_depth：最多回栈的层数，也就是抓取的栈的最大深度。</li>
        <li>fp_unwind：是否进行fp回栈。</li>
        <li>malloc_free_matching_interval：native_daemon从nativehook so的共享内存里取数据的间隔时间。</li>
        <li>string_compressed：是否进行字符串压缩。</li>
        <li>fp_unwind：fp回栈。</li>
      </ul>
      <p class="fontColor">
        输入hdc_std shell，进入设备，执行命令。<br />
        <img src="../figures/NativeMemory/nativeexcutecommand.jpg" alt="GitHub Logo" /><br />
        执行完成后，进入指定目录查看，在/data/local/tmp下就会生成trace文件。<br />
        <img src="../figures/NativeMemory/naitvememoryfile.jpg" alt="GitHub Logo" />
      </p>
      <h2 class="mume-header fontColor">Native Memory展示说明</h2>

      <p class="fontColor">将抓取的nativememory文件导入到smartperf工具中查看，查看内存的分配和释放等情况。</p>
      <h3 class="mume-header fontColor">Native Memory泳道图展示类型</h3>

      <p class="fontColor">
        点击齿轮状的图标可以设置内存的展示单位。<br />
        <img src="../figures/NativeMemory/NativeChart.jpg" alt="GitHub Logo" />
      </p>
      <ul class="fontColor">
        <li>
          <pre class="smartperf-text fontColor light">
Current Bytes：以申请内存的size绘制泳道图。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Native Memory Density：以申请内存的数量绘制泳道图。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
All Heap&amp;AnonuymousVM：malloc分配和mmap分配的总量。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
All Heap：malloc分配的内存。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
All Anonymous VM：mmap分配的内存。
</pre
          >
        </li>
      </ul>
      <h3 class="mume-header fontColor">Native Memory泳道图的框选功能</h3>

      <p class="fontColor">
        可以对内存的数据进行框选，框选后在最下方的弹出层中会展示框选数据的统计表格，总共有四个tab页。<br />
        Statistics的Tab页，主要显示了统计明细类型。<br />
        <img src="../figures/NativeMemory/Statistics.jpg" alt="GitHub Logo" />
      </p>
      <ul class="fontColor">
        <li>
          <pre class="smartperf-text fontColor light">
Memory Type：内存的类型。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Exsiting：框选区域内申请没有释放的大小。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
#Exsiting：框选区域内申请没有释放的次数。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Transient：框选区域内释放的大小。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
#Transient：框选区域内释放的次数。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Total Bytes：框选区间内申请的大小。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
#Total： 框选区间内申请的次数。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Peak Value： 框选区间内内存申请的峰值。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Exsiting/Total：框选区间内剩余的内存比上申请的内存，其中浅紫色是框选区间内申请的大小/整个时间轴（申请+释放的总大小)，深紫色是框选区间内(申请+释放)的大小/整个时间轴（申请+释放的总大小）。
</pre
          >
        </li>
      </ul>
      <p class="fontColor">
        Call Info的Tab页，主要显示了调用树详细类型。<br />
        <img src="../figures/NativeMemory/CallInfo.jpg" alt="GitHub Logo" />
      </p>
      <ul class="fontColor">
        <li>
          <pre class="smartperf-text fontColor light">
Symble Name：每个内存分配的调用栈。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Size：分配的总大小。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Count：相同调用栈出现的次数。
</pre
          >
        </li>
      </ul>
      <p class="fontColor">
        Native Memory的Tab页，主要显示了单次分配信息列表。<br />
        <img src="../figures/NativeMemory/NativeMemory.jpg" alt="GitHub Logo" />
      </p>
      <ul class="fontColor">
        <li>
          <pre class="smartperf-text fontColor light">
Address：内存块的地址。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Memory Type：内存分配的类型。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Timestamp：时间戳信息。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
State：内存地址当前状态Existed 表示框选范围内未释放，Freed表示已释放。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Size：该次申请分配内存的大小。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Responsible Library ：调用该函数的库。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Responsible Caller  ：调用该函数的方法。
</pre
          >
        </li>
      </ul>
      <p class="fontColor">
        Snapshot List的Tab页，主要显示了各时刻内存的增长的差值。<br />
        <img src="../figures/NativeMemory/Snapshotlist.jpg" alt="GitHub Logo" />
      </p>
      <ul class="fontColor">
        <li>
          <pre class="smartperf-text fontColor light">
Snapshot：标记的打点说明。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Timestamp ：时间戳信息。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Net Growth ：自从上次Snapshot的增长量，是计算的分配和释放的。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
Total Growth ：自从上次Snapshot的增长量，是计算的每一次分配的。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
#Exsiting  ：仍然存在的内存数。
</pre
          >
        </li>
      </ul>
      <h3 class="mume-header fontColor">Native Memory的辅助信息功能</h3>

      <p class="fontColor">
        在Call Info和Native Memory的Tab页，点击选中某一行，右边画红线处会显示出该行调用栈的树结构信息。<br />
        <img src="../figures/NativeMemory/nativecallstack.jpg" alt="GitHub Logo" />
      </p>
      <h3 class="mume-header fontColor">Native Memory详细显示的过滤功能</h3>

      <p class="fontColor">
        点击下方的All Allocations可以对Allocation的lifeSpan进行过滤，有三个选择：All Allocatios，Create &amp;
        Exsiting，Create &amp; Destroyed。<br />
        <img src="../figures/NativeMemory/lifespan.jpg" alt="GitHub Logo" />
      </p>
      <ul class="fontColor">
        <li>
          <pre class="smartperf-text fontColor light">
 All Allocations：所有的内存。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
 Created &amp; Exsiting：创建且被存活的内存。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
 Created &amp; Destroyed： 创建且被销毁的内存。
</pre
          >
        </li>
      </ul>
      <p class="fontColor">
        点击下方的All Heap&amp;Anonymous可以对内存类型进行过滤。<br />
        <img src="../figures/NativeMemory/AllocationType.jpg" alt="GitHub Logo" />
      </p>
      <ul class="fontColor">
        <li>
          <pre class="smartperf-text fontColor light">
All Heap&amp;AnonuymousVM：Heap和AnonuymousVM的总量。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
All Heap：malloc分配的内存。
</pre
          >
        </li>
        <li>
          <pre class="smartperf-text fontColor light">
All Anonymous VM：mmap的匿名页。
</pre
          >
        </li>
      </ul>
      <p class="fontColor">
        点击下方的Mark Snapshot可以在时间轴上打标签。出现小旗的标志，通过标注多个时间点。点击到Snapshot
        List标签页可以看到各个时间点的内存的增长值。<br />
        <img src="../figures/NativeMemory/Generation.jpg" alt="GitHub Logo" />
      </p>
      <h3 class="mume-header fontColor">Native Memory的火焰图功能</h3>

      <p class="fontColor">
        点击callinfo左下角的柱状图的图标，会切换到火焰图页面。<br />
        <img src="../figures/NativeMemory/nativeflame.jpg" alt="GitHub Logo" /><br />
        进入到火焰图页面，火焰图的展示跟Callinfo的tab页的调用栈显示一致，鼠标放到色块上，悬浮框可以显示调用栈名称和size大小。<br />
        <img src="../figures/NativeMemory/nativeflameshow.jpg" alt="GitHub Logo" /><br />
        鼠标左键火焰图，会进入下一级界面，右键回到上一级。<br />
        <img src="../figures/NativeMemory/nativeflamelevel2.jpg" alt="GitHub Logo" />
      </p>
      <h3 class="mume-header fontColor">Native Memory数据统计功能</h3>

      <p class="fontColor">
        选择Use Record Statistics和statistics interval配置项抓取的数据，只会显示Call Info的Tab页，Call
        Info相关功能同上。<br />
        <img src="../figures/NativeMemory/statiscsCallInfo.jpg" alt="GitHub Logo" />
      </p>
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